Pauses in segments is impractical and unnecessary IMO. The driving home and forgetting the gps thing is super common. Especially segments near parking areas for recreation.
I once got a couple KOMs on a ride. I had one flagged. It was uphill and no stop signs on the segment. However, that KOM didn't pop up into my activity for a few hours. Weird. But, the ride was flagged already. I only saw another KOM that was lost due to the flagging. I accidentally posted a comment to the wrong user's Strava feed asking "WTF mate".
It wound up, after the other segment showed up, that it was the other person who flagged if in rage. They were some pleb who had gotten the segment at like 10mph slower. People can hill sprint for 30 seconds at like 25mph. He apparently didn't think that possible despite the power and HR data.